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Q1:1. The resistances and reactances of a 25kVA 50Hz 2400:240V distribution transformer are R-0.650 £2, R2-0.00650 £2, X=7.0 £2, X2=0.070 £2, X=100 £2, where subscript 1, 2, / and M denotes the 2400V winding, 240V winding, leakage inductance and magnetizing (i.e., mutual) inductance, respectively. Each quantity is referred to its own side of the transformer. Core loss is negligible. Suppose a 240020°V power source is connected to the high-voltage side supplying transformer's rated KVA at 0.8 PF lagging. Draw the equivalent circuit referred to the low-voltage sides. Label the impedances numerically in ohms and henrys. b. Find the low-side terminal voltage phasor using the equivalent circuit in (a). Neglect the magnetizing branch. c. Find the equivalent circuit in per-unit. Use the rated power of the transformer as the power base. Include the magnetizing branch. d. Find the low-side terminal voltage phasor using the per-unit circuit in (c). Neglect the magnetizing branch.See Answer
Q2:Activity 3 You have been asked to contribute to a documentation package for the customer of a transformer power monitoring system. Carry out the following experiments in the laboratory and produce a report: A) In a timing circuit for measuring power output of a transformer, a square wave is made from combining sine waves of different harmonics. Using MATLAB, create a square wave of 480Hz and show the component waves using screen shots from MATLAB, with descriptions. Ensure the frequencies and amplitudes are identified and describe how the complex wave is formed.See Answer
Q3:Task 4.1 - Calculate basic electrical parameters in D.C. circuits using electrical circuit theory A) What is the current when a charge of: a) 3.0C passes through a lamp in 20s? b) 3600C passes a point in 3.0 minutes? c) 0.2μC flows through a diode in 2.0ms? B) A charge of 4000μC passes each point in a wire in 50s. Calculate: a) The charge in coulombs b) The current in the wire c) The number of electrons per second passing each point in the wire (Electron charge = 1.6 x 10-1°C) C) a) What is the pd across a wire of resistance 8.00 when there is a current of 1.5A through it? b) What is the resistance of a wire if a p.d of 6.0V drives a current of 0.25A through it? c) A p.d of 3.0V is applied across a 150 resistor, what is the current? D) a) What is the power of a microwave oven that takes a current of 7.5A from a 230V supply? b) A small 48W electric heater is connected to a 12 V supply, calculate the current. c) When it is hot an electric bar fire has a resistance of 500. What is the power rating? E) A lamp has a p.d of 12V across it. Calculate how much electrical energy is transferred when a) A charge of 400C passes through it. b) A current of 2.5A passes through it for 30s. F) A vacuum cleaner has a rating of 460W on the 230V mains, what fuse should be fitted?See Answer
Q4:Task 4.2- Describe the principles of operation of electrical cells and review the applications in the modern world A) Write down 4 advantages and 4 disadvantages of secondary cells compared to primary cells. B) Write down three different types of fuel cell, for each one include a brief description of the process involved and where it is usedSee Answer
Q5:Task 4.4 Discuss the principles of operation of a DC electric motor outlining modern applications. A) Describe step by step how a D.C motor works, include diagrams. B) Identify three different types of motor, give an application, and at least 4 characteristics that make it suitable for its job.See Answer
Q6:Task 4.4 Discuss the principles of operation of a DC electric motor outlining modern applications. A) Describe step by step how a D.C motor works, include diagrams. B) Identify three different types of motor, give an application, and at least 4 characteristics that make it suitable for its job.See Answer
Q7:Task 4.3 - Determine electrical parameters in series and parallel electrical networks A) A battery with a terminal voltage of 9 V is connected to a circuit consisting of four 2002 and one 100 resistors all in series. Assume the battery has negligible internal resistance. a) Calculate the equivalent resistance of the circuit. b) Calculate the current through each resistor. c) Calculate the potential drop across each resistor. d) Determine the total power dissipated by the resistors and the power supplied by the battery. B) Three resistors R₁=1.000, R₂=2.000, and R3-2.000, are connected in parallel. The parallel connection is attached to a v=3.00v voltage source. a) What is the equivalent resistance? b) Find the current supplied by the source to the parallel circuit. c) Calculate the currents in each resistor and show that these add together to equal the current output of the source. d) Calculate the power dissipated by each resistor. e) Find the power output of the source and show that it equals the total power dissipated by the resistors.See Answer
Q8:Task 4.2- Describe the principles of operation of electrical cells and review the applications in the modern world A) Write down 4 advantages and 4 disadvantages of secondary cells compared to primary cells. B) Write down three different types of fuel cell, for each one include a brief description of the process involved and where it is usedSee Answer
Q9:Task 4.1 - Calculate basic electrical parameters in D.C. circuits using electrical circuit theory A) What is the current when a charge of: a) 3.0C passes through a lamp in 20s? b) 3600C passes a point in 3.0 minutes? c) 0.2μC flows through a diode in 2.0ms? B) A charge of 4000μC passes each point in a wire in 50s. Calculate: a) The charge in coulombs b) The current in the wire c) The number of electrons per second passing each point in the wire (Electron charge = 1.6 x 10-1°C) C) a) What is the pd across a wire of resistance 8.00 when there is a current of 1.5A through it? b) What is the resistance of a wire if a p.d of 6.0V drives a current of 0.25A through it? c) A p.d of 3.0V is applied across a 150 resistor, what is the current? D) a) What is the power of a microwave oven that takes a current of 7.5A from a 230V supply? b) A small 48W electric heater is connected to a 12 V supply, calculate the current. c) When it is hot an electric bar fire has a resistance of 500. What is the power rating? E) A lamp has a p.d of 12V across it. Calculate how much electrical energy is transferred when a) A charge of 400C passes through it. b) A current of 2.5A passes through it for 30s. F) A vacuum cleaner has a rating of 460W on the 230V mains, what fuse should be fitted?See Answer
Q10:Explain why the oscilloscope measurement configuration shown in Figure Q3.1 is (in most cases) incorrect. HINT: Multiple problems are present.See Answer
Q11:For each of the following measurements, state (with reasons) whether a DMM or oscilloscope is the more suitable test instrument. a. The DC voltage of a +12 V dc supply rail in a printed circuit board (PCB). b. The RMS voltage across a resistive heater driven by a 48 V ac 60 Hz square wave. c. The RMS current flowing in a resistor connected across the output of a function generator (5 V pp, 800 kHz). d. The RMS voltage across a loudspeaker with a 12 kHz sinusoidal input.See Answer
Q12:Figure Q2.1 represents the true value of a noisy signal which is to be displayed on an oscilloscope, in order to estimate the amplitude and period of the underlying sawtooth waveform. a. Suggest appropriate vertical axis and timebase settings for the oscilloscope. b. How should the oscilloscope be triggered? Your answer should indicate where on the waveform you plan to trigger (and why!) and how the oscilloscope can be configured to achieve this. c. Two oscilloscopes are available, a 500 MHz 3 GSPS model and a 100 MHz 500 MSPS model. i. Explain what these specifications mean. ii. How will the displayed waveform differ between the two scopes? iii. Which scope is better suited to the measurement described?See Answer
Q13:a. Explain why input impedance is an important property of a voltmeter (and other circuits used for voltage measurement). b. A force sensor has an output of 1 V kN-¹ and an output impedance of 1 kΩ, as shown in Figure Q1.1(a). A force of 2 kN is applied to the sensor. Calculate the measured voltage, equivalent force and insertion error when the sensor's output is measured using: i. An ideal voltmeter (Figure Q1.1(b)) ii. A DMM of input impedance 40 MΩ (Figure Q1.1(d))See Answer
Q14:A transformer has two coils wound on a common core having self-inductances, L₁ = 1H, L2 = 2 H, and a mutual inductance, M = 0.5 H. The currents are i₁ = cos (120 лt) A and i₂ = 0.5 cos (120 лt) A. Assuming a positive mutual inductance for the set of coils, use Faraday's Law of induction to determine v₁ and v₂. Show all of the details.See Answer
Q15:1. (5) Upload a sketch of which pins are internally connected on the breadboard below, which is the same as provided with the Arduino kit. If needed, watch the following video on breadboarding (Breadboards). + 10. 11.. 12 13 14 15 → ១ ០៦ ១ ១ ខន ជន៩៦ 16 17 abcde 19 200 21 22. 23. 24. 25 26 27 28. 29. 0. abcde 30 . .. 12 • 13 . 15 .. .. . . 20 .... ..... 22 23 ... 24 fghij 29 30See Answer
Q16:Determine vo as a function of the input voltages and the resistances. V10 D₂ 0 R₁ + R₂ R₂ www R3 R3 RA ww R₁ +See Answer
Q17:Determine vo as a function of the input voltages and the resistances.See Answer
Q18:4. A 40 kVA, 2000/200 V single-phase transformer has a core loss of 600W at rated voltage and a copper loss of 500W at rated current. Calculate the efficiency at i) full load with unity power factor, half load with 0.85 power factor lagging. See Answer
Q19:2. Discuss how to determine the magnetizing and working component of the no-load current and draw the phasor diagram to represent these quantities. See Answer
Q20:1. Does the transformer draw current from the source, even there is no-load connected to it? If yes, explain why? See Answer

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